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5 Sheets- Sheet 1. J. G. GITHENS.

NUT THREAD CUTTING MACHINE; No. 456,324, Patented July 2 1, 1891.

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J. C. GITHENS'. NUT THREAD CUTTING MACHINE. No. 456,324. Patented July 21, 1891.

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J. C. GITHENS. NUT THREAD CUTTING MACHINE.

No. 456,324. Patented July 21, 1891.-

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(No Model.) 5 Sheets-Sheet 4. J. C. GITHENS. NUT THREAD CUTTING MACHINE.

Paten-ted July 21, '1891.l

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NUT THREAD CUTTING MACHINE. No.' 456,324. Patented July 2l, 1891.

ters aixed to a non-rotating cutter-bar ex- To all whom it may con/cern,.-

tothe cutter-bar during the cutting operav the cutter-bar to its normal position prepara- UNITED STATES PATENT' OFFICE.

AJOSE-'PH O. GITHENS, OF NEV YORK, N. Y.

uNUT-THREAD-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent N o. 456,324, dated July 21,1891.

Application filed March 14, 1891.

Be it known that I, JOSEPH C. GITHENs, of the city and State of New York, have invented certain Improvements in NntlThread-Outting Machines, of which the following is a specification.

rlhis invention is especially intended to facilitate lthe cutting of the threads ot the leadnuts employed in rock-drills and other machines in governing the feeding movements of a drill or other tool.

The invention consists in chuckin'g the nutblank in the hollow hub ofa' rotating gear mounted upon a carriage adapted ,to slide transversely across the bed of the machine for the purpose of permitting` the rotating nut-blank to be moved up to a cutter or cuttendingthrough the nut-blank and adapted to slide endwise in boxes arranged on either side of and in close proximity to lthe ,hollow hub in which the nut-'blank is chucked.` By means of a lead-screw engaging a parting nut with which one end of the cutter-bar isconnected the proper endwise movementis given tion. At the conclusion of each *cut the chuck-carriage is moved back to clear the nutblank from the tool, and the parting-nut is disengaged from the lead-screw, so lthat a weight suspended from a chain led over a sprocket-wheel and connected with the adjacent end of the cutter-barwill rapidly return tory to making another cut. One of the boxesinwhichthe cutter-barslidesismounted upon a standardv adapted to slide in a longitudinal direction upon the bed-plate ofl thel machine. To extricate the finished nut from the chuck, the chain is unhooked from the cutter-bar after the completion 0fthe last cut, the hook is detached from the end of the cutter-bar, the longitudinally-sliding standard is moved away from the end of the chuck, and the nut, having previously been released from the devices which have held. it in the chuck, is then slipped off the end of the cut'- ter-bar, so that another nut-blank can be slipped onto the end of the cutter-bar and fastened in the chuck. The longitudinallysliding standard is then returned to its position in proximity to the chuck, the hook is Serial No. 385,046. (No model.)

In operation, when.

justably mounted upon the sliding cutterbar stops the machine by striking against the shifting-lever of a clutch splined on the driving-shaft, and thereby disengages the said clutch from the driving-pulley.

The'accompanyng drawings of a threadcuttinginachine lembodying the improvements are asfollows:

Figure l is a top view vation. Fig. 2 is a transverse vertical section taken through the plane indicated bythe dotted line 'U t on Fig. 2.

Fig. 2 is aside ele- Fig. 3 is a longitudinal section taken through the-horizontal plane indicated by the dotted line ,au on Fig. l. Fig. 3a is.'V a transverse vertical section taken through the plane indicated by the dotted line 'to/tu on Fig. 3. Fig. 4 is a longitudinal section taken through the ver? tical plane indicated bythe dotted line a@ cc on Fig. 3, but illustraing the cutter-bar in the lposit-ion which it occupies `at -the end of a cut, and illustrating the manner in i which, after the linished nut has been withdrawn, a nut blank is slipped over the end of the cutter-bar preparatory to being introduced into the rotating chuck. Fig. 5 is a transverse vertical section taken through the plane indicated by the' dotted line yy on Fig.

3, showing, partly inV section and Apartly in elevation, the parting-nut holder. Fig. 5' is a transverse vertical section taken lthrough the plane indicated by the dottedlineszzon Fig 3, affording a viewin elevation of the clutch andclutch-shit'ter. Figs. Gl and 7 are respectively a side elevationand end view of a iianged cylindrical nut-blank. Fig. 8 is a view of the face of the rotating hub, showing the manner of securing a hanged cylindrical nut-blank therein. Fig. 9 is an elevation,

IDO

partly in section, of the rotating hub and the adjoining portion of the gearwvheel conn eeted to or formed integrally with the hub. 10 and 1l are respectively a face view and a side elevation, partly in section, illustrating a modification adapting the hub for holding a nut-blank which is square in cross-section.

The machine represented in the drawings is composed of a suitably-supported bed-plate A, provided with a longitudinal undercut groove A', to receive the heads of the screwbolts for securing to the bed the various movable standards or carriages for supporting the operating parts of the machine.

The power to drive the machine is supplied by a belt on the loose pulley a. Bymeans of the spring-operated clutch d the motion of the driving-pulley is transmitted to the prime shaft l), to which the clutch is splined. A pinion c, splined to the prime shaft, engages and drives the gear d, the somewhat elongated hollow hub d of which serves as the rotating chuck for holding the nut-blank. The prime shaft b has also affixed to it the pinion c for engaging and driving the gear e', afiixed to the shank of the lead-screwf, journaled in the box f' on the standard f2. The lead-screw is adapted to engage a parting nut, the two halves ff f'l of which are seated in the head g on the outer end of the hollow carrier g', adapted to slide in the bearing g2, formed iu the adjustable standard g3. rlhe inner end of the sliding carrier g is provided with a holder g4 for holding the adjacent end of the cutter-bar 7L, which is adapted to slide in the bearing t', formed in the upper part of thestandard t", and extends therefrom through the hollow hub cl', and is also adapted to slide in the bearing j, formed in the upper part of the adjustable standard j. The cutter-bar 7L is provided with one or more cutting-teeth 7L', and has at its free end a detachable hook h2 for engaging one end of the chain h3, which is led over a sprocket-wheel h4, and has its opposite end attached to a suitablyheavy plunger h5, loosely seated in the dash-pot h6.

By means of a crank 717, afxed to the shaft of the sprocket-wheel h4, the weighted plunger h5 can be lifted to slacken the chain and release it from the hook 7a2. By the engagement of the lead-screw f with the parting nut the necessary endwise feed is given to the cutter-bar h during the cutting operation, at the conclusion of which the two parts of the parting nut are thrown out of engagement with the lead-screw in the usual manner by pulling over the actuating-lever f5 into the position in which it is represented in Fig. 7, thus permitting the weighted plunger h5 to pull back the cutter-bar and carrier g into the positions in which they are represented in Fig. 2.

As a matter ol precaution the cutter-bar is provided with a detachable collar or tappct 7c, which may be so adj usted upon the Cutterbar that at any prescribed stage during the 'feeding movement of the cutter-bar it will strike against the shifting-lever 71; and throw the clutch a out of engagement with the driving-pulley a, and thereby stop the machine.

Lead-nu ts are frequently made from cylind rical blanks havinga flange extending partly around one end, as illustrated in Figs. G and 7. For chucking such blanks the hollow hub CZ is bored to fit the cylinder Z of the blank, and at one end is counter-bored to afford a seat for the flange of the blank. The fiange is held in its seat by the screw nninserted in a hole tapped in the end of the hub in suitable position to enable the head of the screw m to lap over the edge of the fia-nge. To prevent the blank from turning in its seat, a flatfaced key m is inserted in the end of the hub in position to engage the iiat portion l of the nut-flange, as illustrated in Figs. 8 and 9.

To adapt the rotating chuck for holding and centralizing a polygonal nut-blank, the hollow hub d of the gear (l is elongated, as illustrated in Figli, and provided with radiallyarran ged set-screws n, the inner ends of which bear, respectively, upon the faces of the polygonal nut-blank o, as illustrated in Figs. l() and 1l.

In this machine the work is fed up to the cutter. To accomplish this the chuck-gear d and the adjacent portion oi' the prime shaft?) are mounted in a transversely-sliding carriage p, to which the required feeding movement is from time to time given by the usual Worm q engaging a nut q', suitably fastened to the carriage p. The worm q is provided with a fixed collar q2, which bears against the inner end of the adjustable sleeve fr, the outer end of which bears against the hub qof the crankarm q, by which the worm is operated. The sleeve o' is seated in the projecting portion s of the bed s', on which the carriage p slides. The sleeve r has affixed to it the vertical pin r', which extends upward through a slotted aperture lin the sway-bar t, provided at one end with the handle t', and having its oppo site end pivoted to the projecting portion s of the bed s. By means of the sway-bar 't motion can beimparted to the sleeve r, and hence to the wormq and the carriage p. At the conclusion of each cut the sway-bar is pulled outward to withdraw the nut-blank from the path of the cutter while the cutter-bar is being pulled back to its normal position. The sway-bar is then pushed inward and drops into a notch t2, which serves to hold the swaybar, and hence the carriage p, in the position to which it has thus been moved. A further movement is given to the carriage p to the extent equal to the depth of the next cut by turning the worm q. Although the required range of transversemovement of the carriage p is comparatively small, it is preferable to provide the prime shaft with the knucklejoints B B, instead of relying merely upon the IOC IIO

IIS

spring of the shaft to enable it to accommo- `v ing in the carriage p.

lVhat is claimed as the invention isl. In a nut-thread-cutting machine7 the combination, as herein described, of a rotating gear provided with a hollow hub for serving as a chuck for a nut-blank and mounted in a carriage adapted to be fed transversely across the bed of said machine, a cutter-bar provided with a cutter or cutters and extending through said hub and sliding endWise in boxes respectively on opposite sides of said hub, a lead-screw for im partingendWise-feeding movement to said cutter-bar, and a standard supporting one of said boxes and adapted to be moved longitudinally' along. the bed of said machine a sufficient distance to disengage said box from the free end of said cutter-bar, as and for the purposes set forth.

2. The combination, as herein described, ot' a rotating chuck` mounted in a transverselysliding carriage, an endwise-sliding cutterbar extending through said chuck and connected at one end to a sliding carrier containing a parting nut, a lead-screw for engaging said parting nut and imparting a' prescribed speed of endWise-feedng movement to said cutter-bar, and a weight suitably connected' with the opposite end of said cutter-bar for rapidly pulling said cutter-bar back to its normal position when said parting nut has been disengaged from said lead-screw aftera cut hasbeen completed and said transverselysliding carriage has been retracted to afford the necessary clearance for the cutters upon said cutter-bar. p 3. The coinbinatioi1,as herein described, of the lead-screw f, the parting-nut carrier g', the endWise-moving cutter-bar h, and the tappet 7o, fastened upon said cutter-bar with the clutch-shifter 7c', the clutch a', the driving-pulley i, the prime shaft b, and gearing for transmitting from the said prime shaft power'to rotate said lead-screw, for the purpose of disengaging said clutch from said driving-pulley at a prescribed stage in the feeding movement of said cutter-bar.

JOSEPH C. GrITHENS.l Witnesses:

A. M. JONES, J. E. BURNS. 

